The present invention is directed to a one-piece corner duct that routes wires in a corner of an enclosure. The polymer electrolyte membrane is a sulfonate of a hydrocarbon-based polymer comprising a main chain in which two or more benzene rings are bound together directly or through a divalent group. A viewer wearing a dedicated viewing device equipped with an optical filter which allows counterclockwise-rotating, circularly polarized light to pass through can selectively see the image projected by the first liquid crystal projector. A second plurality of rollers are disposed radially between the race and the cam, and are interposed between the first plurality of rollers. In addition, the second housing may have multiple position relative to the first housing in which each position activates a particular function of the device.